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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7f71e33776987cf8118daf28bf67178e9b24fb551e1dcc076d1727098248f16' 
  AND token = 'FfU6Up2YgCwAk9Ev6XW3JezfuFDtJFMc140qf62RYLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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