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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '903657e3c17bcac68834c79d3089308b7ba867aac198cbc56c133a23306f185a' 
  AND token = 'pAixy31dR1hagE/yMQVn9mRcj9XvRTy4Ya7/OZo9px0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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