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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fa4efa26a2c952a7da0511162e660d8cef2c865e993a69fcb9387e9342374c9' 
  AND token = 'vLHXzRiGMx1W/dl+Py0RcVaCnJcAgA/3HU1VxqteawI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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