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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '009b2b68233e4ae847f73efd042164fc223505c6eef81d486ba83699af9a6d91' 
  AND token = 'Ad7zkPBIveWhb2m5LCxKn3ONLQv2JErKX0xnIyMd6Dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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