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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ec846e0b97fcd745e15f9b450a961e9ebde7a9b6b59f132ca57f27c59b5447c' 
  AND token = 'DhUpRbAl9ejdA22O91Q4U8dSCm8qtrVA/wxF3pvJmm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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