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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b0ffe8ad5ef4e350d3ec99d582ecc5a482ec3866f8d5c3845e072aad690cb5e' 
  AND token = 'S2LwTmn9lxSUOoZdm8r1C9/zw0/H0IuYux7FtyefVxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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