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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cceb71cb73271313451c5d9ec84d83b61faba05c8faa4e358801e55a48e351bb' 
  AND token = 'mwyBchkBkilOl6xbbBAoN4ejLpxvU24D5xn4hni0m/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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