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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ea084e5c9d8e39d9016617f713578e0548bd6c9e900984769dfdf7c85661e3a' 
  AND token = '1yCF+l8n15HdQ8A5kLzSfuNIsKBFSK2QXMwbVXdxvIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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