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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4510861ca78df6ebd7d95aa58320e3a809e1df7aa45066dab83a67fe852909b' 
  AND token = 'NjwjfeyDJfq88Z3ywKUmdzB3vV3CGrSFmICjvbqiZSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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