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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8db24f2136c96f0f948e26dd4ee697e245254ec793c2b6ea854a4e2a4841a37e' 
  AND token = 'Du42K9B8g4F+vi6QhicyMcu0U82Q13gB9ehPA8Ba/78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}