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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69a7cd00dafc9966d6dfab3ed7535fdaa8b8438c8e4fb139fd875a7c7d193f08' 
  AND token = '7uPdkZFKgNyn3+elYvXYCJjXC0wQNODwRl/lk4O8rac=' 
  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"
    }
  }
}