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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fab9bc1481633c356ab2b7ead746e6dec3b92727e622f043c847e8531fc1bd5d' 
  AND token = 'uOF1FFroS0FP4cjN2tBxi9TlhVOlt7Boj/EydZZiC3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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