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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16286d802b911269e25d1934b48eb6e7002b758a8321d6b0c28ccfacb62b871a' 
  AND token = 'RLnSRQz9d1OmCi9qTdD9gEMuy0i9d+icjFSdRJPMZ8A=' 
  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"
    }
  }
}