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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64dc1bd9ba238e2bab6ad2f320ecf61137f49f0bbf4e29772af3e63755e24b12' 
  AND token = 'gjNeRlWhzIXcubi3gI8MFJTAMoC60EHeKpg4q6VPm4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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