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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54b83f0071db3d19d191fe91ebbb4424d60b812752cdedf9c9c0ce12358d6d79' 
  AND token = '0UPavAq2QVy8exwd3iNuugCKMeb8DO2ACpsDCjIWhK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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