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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f0cd7f5e663f5855f8effdafd1ccd151c27036172b6aa00d52289533791fe1d' 
  AND token = 'Bqb8yQ1VQmQBvI1sgwCwbZ50y7XH33EtB9rxGAdBrtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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