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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c9b33540a435189c73065a68ebcd1c1c2ba74dcc754078ca29e5f05f9f32fa4' 
  AND token = 'FsPkwKLQFFWg1kz7qpl9or0lx0C3/Q5shLfrCodXh+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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