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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53106fbb07ded8938f606cf7d0285047b21d0bd260ca63e14de263a519cf6744' 
  AND token = '7Aa9TWfxlFI/6xWOEpR1Glr7P9ViJ0tEQ9q0S6E+15A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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