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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f79ca0da9626e3edd09720049963baf7422139be54ed9ddcbbf4a035e895448a' 
  AND token = 'egubJabktnpPTMWL6JDqy0elf+IUktr96AfF5g3ICLs=' 
  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"
    }
  }
}