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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efa94cee30209154bfbfe255d359bb0c22132b8fd79f60e8ce237d7d73928a83' 
  AND token = 'vWshkcUj0OI/S6na6wTMeE3X/75NsEdLjZNFHqQGSnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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