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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db38e0a1c380999a8e7dc84091657c5dcbeb8fca4e07279239a51c9e014e58c3' 
  AND token = 'Tv+CTw08180Q4Nvth6sqI6yRp4B9hSphkCbKTVn8ubQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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