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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bb0a29b36d98bb9d92fa83662ad23dd486e588916a4e84101c378c38a46b828' 
  AND token = 'CcK0nwhSi814+FoFHiaYFxFNlebe4UC+S7GLujpdZsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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