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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e469941afd66574c3d187ce2f509956b594ac7cace878c5ef83d3fe4b3027cd3' 
  AND token = 'tEqiH5JI5jwZirQu1/Hxc/PYQaMKpu5woA0d/2z0f20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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