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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2613fdc7924e346b1d91e069bb89ceeb3e63f8b8d111b5fecd96427178d30798' 
  AND token = 'qzzuOCkTAeBuo4SXSQdQB9pVKc2FVHUG44dgXL0HiOY=' 
  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"
    }
  }
}