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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6246a9ff40026d46acaa9ac424789f288c9961a2406d2c9bf25c9fc045985f84' 
  AND token = 'ZeaE47ASw+AOMmbf7Qk65wXOaNHpt8LXpuBoOTalXrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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