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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06f5dee25ca8f8f33c22cb2d5b3909f519061d66d7e21491f4e690f827182259' 
  AND token = '0Cra5VQEAnUI65lyYrzqPe+7Pf2XeTfMzE4fhQ1vfdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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