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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6fa727bab1d50301b597f5465dc26ebfd99ca214267e0a41a1cd2b63574823e' 
  AND token = 'ORcBD2WqaXwpgm6maUovczTRRMZH4P9ac7iB1VPoWC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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