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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44ac3f1e2d03481de57c0212141428769a23621069a65316a637c9ce906d7a2b' 
  AND token = 'qRCQNw3rx/w1P6JmNQNiO6uJz3n7l/nwn+gG08R9dOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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