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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fb63605c752b197be6877ed4ed1213691afe361ddb0e748669a2e217ddc6023' 
  AND token = 'a3zUh+miswbL1Q8wAOZX4E7MqGBsamJh2Nch7b1TnaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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