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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '997dda55deab21db5d7ff52a1b8a0c54e7c5d8fc3e4235ab861a9466f804d6c9' 
  AND token = 'r26I9m2Zbf53pENvHOD5KlEM4GQyo4vdP7sGdNuAEGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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