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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddab153e24cc13c462ae8495642374f54cad36673f09724ad0afbb9a7ea327d1' 
  AND token = 'N37mdgLDkSh9I10BVMwPZFPpwmc6OPSOP0cUWDpHmU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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