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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72a89dd23c520babb6ae9d0aebffff737e9226a50465f67dc8f5c1f39c0bcf3e' 
  AND token = 'PNk+T1H45bpwMjfKLO4hMnUn1UQThvpnfu9jfyugfn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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