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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48855cfa3a3bbd4e4fe45377ccbf833a7282bd2de77063d58c745a0a0e8cfd19' 
  AND token = '32Flbur5MIZZih/mtbDkmeV0j0g4e90pS3MHWDzHceY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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