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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b5ef7d6d2d1214421ed4a8bdaf06617e6432ffc46907da938fb7a1c9f62f8e3' 
  AND token = '2MVKFSj8u2V+62H4naR2C1RHHsI4dKkb7DNzxYqZ3Y4=' 
  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"
    }
  }
}