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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5258ef96eb42b960e41b7d7bea5cca3960968b1eb43a36565014f5eb8c1512a5' 
  AND token = 'jAH+Qn1/bUfE5f3T/R5BfqTZPDbZU9ETCnOatLCEF3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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