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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c87d06181e7fc8f05d396bdb7b21cd2e4f20521c32ce02648fcf562fcc6677c0' 
  AND token = 'L2dM+18cAoyycVJN1hqI0+JJR9Djs88ChlguVUc9MUg=' 
  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"
    }
  }
}