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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64803cbb73e41439d0cc1889ea65467dedd60f99d7b1e69ff89a35f9bd202a02' 
  AND token = 'SSv0lCpbrTN/H8mUYDsi4td0SwpQ2OIMpNV1rrVRhHU=' 
  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"
    }
  }
}