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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5c4f9867e745d285b1760cca4577628657e4c7e67fe8ee1bef699e981689183' 
  AND token = 'yKO1hcb80uBpXsbHazR7axU9Pa0Z2eejOvDiOENbTjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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