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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f991d82aa9a2d46b91b3f925f6821e275ce084c6f465d724580fba17e36b999' 
  AND token = 'JldTIloEka75AKPD/Dew2UvEfdpIMhO5X21JKbe0XnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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