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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a35d50b491796503dc5c9a74ef0163f81929d4c20ab49e52733de1ca3019a12' 
  AND token = '6ml84HJAMwZ0LtBb0IBy00DU+kGpCIYUGIy2J2PeggI=' 
  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"
    }
  }
}