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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '452b8afd64bcfaa45c6ab3463d1f5490d8abb650e9fda6674aa3f53392ee064e' 
  AND token = 'S899HEKwEccGX05UGWEndR62b+QGhmPrRdDcpEkmsYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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