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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8e4b130d7f470cce87a45cc396e2a9cb118ae8a69c301683a5b9d83685d8701' 
  AND token = 'HW5cyWAlS3aIW158hPWqh5Gu7edyqNgcD2R9yGQarRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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