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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bda9494a8758ca210633108e952975f24f6b0fe4cf4ec1243e05281d7d47f85c' 
  AND token = '1H/nS27iKMGLTTmvXgZ0Hs7y3qXQC7L+A44Lp3pGffw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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