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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '804ae9cfd8607b0025c57b2303792cc28a3b996881444eca865983ecf686b3c2' 
  AND token = 'Hm1wG+IGgzaoboF53kbvcotK0/W+QHVRLFXtXQx/eSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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