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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24bc07d4ff4b0b60c3cf2a0a4c19044756d474b042940e42766233d47cb28a8f' 
  AND token = 'Vv6orT0bDajMMGmgSWu7Eg2hbxeLFnUPPsZpDP5baSw=' 
  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"
    }
  }
}