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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '754730e5030550281ab18415beb08c4829c6a20cf54c6ea4a4ab0aeb75e34b04' 
  AND token = 'yMZ8J11m0m07UqHNmc6AWwOiTrFI9P4lFI2lcuSgEXA=' 
  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"
    }
  }
}