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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '066f972e2a7e5ea4ce24dcdce64c188241d23452125cacb2466202c7fdad6918' 
  AND token = 'hWHl+p4z0jT4EPXOXPzf+I6HDyFdKyy+KxkhVxWS6zo=' 
  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"
    }
  }
}