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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10a8bd507286ed9034485b7d14339924bb3f57df744b4a8037af0635c1b62438' 
  AND token = 'XImJXoJV9feoIZFPUeQ616mpy7N8WStR1aTMH2b3MHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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