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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '267ba965fe1673288277db459c0c5c1cb2f8e3196199cf28be09214b35f4d7a2' 
  AND token = 'D90+BcpiUcHojA4F1kkRTTP1DRDqgL4fhKdTamjFjds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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